The Dilworth Trust Board is one of New Zealand's largest charities and provides the funding to support Dilworth School. James Dilworth left an original endowment of more than £100,000 in land and funds in his 1894 will. Since then, the endowment has been invested wisely and grown into a diversified portfolio of investments. Dilworth Trust Board still invests mostly in property, especially commercial property close to the Auckland campuses. It also holds a number of other investments including shares, both in New Zealand and overseas. The Trust Board staff manages the property portfolio, while professional fund managers are engaged to manage the non-property investments. All revenue generated funds the operating costs of the school and any capital development. Additionally, about 5% of the annual operating expense of the school is covered by the government grant provided to all independent schools.